The Vikings returned to the practice fields at Winter Park on a sun-splashed Sunday in Minnesota, resuming their training camp schedule following their second game of the preseason on Friday night and a day off on Saturday. Vikings Head Coach Leslie Frazier addressed reporters after the abbreviated Sunday practice, saying he was pleased with the way his team worked and is looking forward to another week of practice leading up to the team’s third game of the preseason, which will be played on Sunday night in San Francisco.

Here are a few other notable topics Frazier addressed on Sunday…

Peterson will playFrazier wouldn’t delve into detail, but he did disclose that running back Adrian Peterson is set to make his preseason debut on Sunday night. These types of decisions are always subject to change, of course, but it sounds like right now the plan is for Peterson to get at least some work with the starters in San Francisco. This is good news for a lot of people – fans who will be at the game, Vikings fans who love watching Peterson play and executives who want bigger television ratings. But it’s also good news for Christian Ponder because San Francisco’s defense will not be able to play the Vikings the way Houston’s and Buffalo’s did, or else Peterson will slice through them like a hot knife through butter. Ponder and the passing game should get some good looks on Sunday night, and now it’s time for them to execute.

Defensive tackle Christian Ballard was placed on the Active/Left Squad list, and Frazier said he is dealing with some “personal matters.”

Ready for read-optionThe 49ers run the read-option offense with quarterback Colin Kaepernick, and Frazier said it’s good for his team to see some read-option in the preseason because he estimates that 4-5 teams on the regular season schedule use that scheme. Carolina, Philadelphia and Washington are three that come to mind, and perhaps Frazier was thinking of Seattle, as well.

Use Buffalo mistakes to buildAs a fan, it’s easy to become frustrated with what happened in Buffalo on Friday night. The struggles of the offense early in the game overshadowed several other positives that transpired. But a point Frazier hammered home to his team in the locker room on Friday night is a point he also mentioned on Sunday in his press conference – the team will take the mistakes they made on Friday night, use them as a learning tool and then one day down the road look back at the Bills loss and say it was an important building block for a successful 2013. That doesn’t erase the bad memories of high snaps and incompletions and poor blocking, but it shows the perspective Frazier has and why so many players buy into his program.